Pitman.



APPLICATION FILED AUG. 5, 1903.

N0 MODEL.

UNrTnn STATES Patented June 28, 1904.

.PATENT @Fries PITNIAN.

SPECIFICATION forming part of Letters Patent No. 763,802, dated J une 28, 19(14.

Application filed August 5, 1903.

To all wil/0m t may concern:

Be it known that I, JAMns LUTHER ScoTT, a citizen of the United States, residing at Lair, in the county of Harrison and State of Kentucky, have invented a new and useful Pitman, of. which the 'following is a specification.

This invention relates to pitmen, especial reference being had to that class of pitmen in which a pitman-head is pivotally connected to a pair of slides arranged for reciprocatory movement in ways formed on the face of'a disk anddisposed substantially at right angles to each other.

The object of the invention is to improve the construction of pitmen of the class described by providing a simple, inexpensive, and effective construction by means of which a rotary motion may be converted intoreciproeating motion, and vice versa, and in which the throw of the pitman may bereadily and quickly adjusted to diiferent lengths.

' The invention consists in the construction, novel combination, and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and having the novel features thereof particularly pointed out in the appended claims. A

In the drawings, Figure 1 is a view in perspective of the invention. Fig. 2 is a View in side elevation, a part being broken away to show the connection of one of the slides with the pitman-liead. Fig. 3 is a section on the line 3 3 of Fig. 2, and Fig. 4 is a transverse section through the pitmanhead on the line 4 4 of Fig. 3. p

Referring to the drawings, in which corresponding parts are designated by the same characters of reference throughout the several views, 1 designates a disk designed to be mounted upon a shaft and provided with diametrical ways 2, disposed at right angles and havingoverhanging portions 3 to form means for engagement with the surface of slides 4 and 5, arranged for reciprocation in said ways.

The overhanging portions 3 may be formed integral with thel remainder of the disk structure, if so desired, or may preferably be the margins of quadrantal plates 6, secured upon Serial No. 168,376. (No model.)

the body' of the disk by means of screws 7 or other suitable fastening means.

The slides 4 and 5 are provided with wristpins 8 and 9 for engagement with bearingblocks 10 and 11, secured, in the manner presently to be described, within a slot 12 in the pitman-head 13.

The pitman-head 13 is at one end of the pitman rod or bar14 and is provided with aslot 12, above mentioned, which extends throughout almost the entire length of the pitman* head and is open at one end, as shown. Upon the lateral faces of the slot 12 are preferably provided a pair of oppositely-disposed ribs 15, and slidably supported within the slot by engagement of the ribs 15 with corresponding grooves in the sides thereof are the bearingblocks 10 and 11, which will preferably be through openings in the openings 18 in the I pitman-h'ead, which form a suitable keyway.

In order to hold the key 17 in rigid association with the pitman-head, I provide a yoke 19, which ts over the slotted end of the pitman-head and may be secured thereon by means of a screw 20, passing through one side of the yoke and engagingwith an opening in the pitman-head.

At the middle of the yoke 19 is a screw 21, which extends inward. through a filler-block 22 and engages with a notch 23 in one side of the key, which is thus positively prevented from being dislodged from the key-seat until the screw 21 is withdrawn.

As the key passes through the sides of the yoke asy well as through the sides of the pitman-head and the screw 21, carried by the yoke, prevents the dislodgement of the key, all the removable members associated with the pitman-head will be held in rigid association until the screw 21 is withdrawn from engagement with the notch inthe key.

In order to hold the wrist-pins 8 and 9 in the bearing-blocks l0 and 11, I provide on each wrist-pin a washer 24 and a small capplate 25, which is secured in position on the end of the wrist-pin by means of a screw 26, passing through the cap-plate and into the end of the wrist-pin.

The operation of a pitman constructed in the manner above described is exactly like that of other pitmen of the same general type; but owing to the way in which the bearingblocks are secured in the pitman-head it is a matter of but little difliculty to remove the bearing-blocks and the spacing-blocks from the pitman-head and by substituting other spacing-blocks of different length to increase or decrease the throw of the pitman within the limits allowed by the dimensions of the disk and the ways formed thereon. The pitman is therefore susceptible of adjustment to meet differing requirements as to speed and length of stroke or power of the stroke, a feature which is, so far as I am aware, absent from pitmen of this type as constructed prior to my invention.

It will be seen from the foregoing description and from an inspection of the drawings that the pitman is simple in construction, is designed to render effective service when in use, is capable of a considerable range of adjustment, and may be employed for a greater variety of purposes than other pitmen of the same general type.

Having thus described the construction and operation of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination in a device of the class described, of a pitman-head having a longitudinal slot therein, bearing-blocks in said slot, spacing -blocks to hold said bearingblocks in proper position, means for positively fastening said bearing-blocks and spacing-blocks within said slot, a disk having ways, slides reciprocable in said ways, and wristpins mounted on said slides and journaled in said bearing-blocks.

2. The combination in a device of the class described, of a pitman-head having a longitudinal slot therein, oppositely-disposed ribs formed on the longitudinal sides of said slot, grooved bearing-blocks and spacing-blocks slidably mounted in said slot, a key for securing said blocks in fixed position within said slot, and means for positively preventing' the withdrawal of said key.

3. The combination in a device of the class described, of a pitman-head having a longitudinal slot formed therein and extending to one end thereof, bearing-blocks and spacingblocks slidably mounted in said slot, a key disposed transversely of said pitman-head to retain said blocks Within said slot, a yoke secured in position on the end of said pitman by means of said key, and a screw mounted in said yoke and adapted to engage said key to prevent its withdrawal.

4. The combination in a device of the class described, of a pitman-head having a longitudinal slot therein extending to the end of the pitman-head, bearing-blocks and spacingblocks of different lengths slidably mounted in said slot, a filler-block disposed in the end of said slot, a key disposed transversely in said pitman-head and extending through said filler-block, a yoke secured in position on the end of said pitman-head by means of said key, and a screw mounted in said yoke and extending through said iiller-block to engage said key and positively prevent its withdrawal.

In testimony that I claim the foregoing as my own I have hereto aiixed my signature in the presence of two witnesses.

JAMES LUTHER SCOTT.

Witnesses:

JOSEPH IRVINE BLANToN, THoMAs E. KING. 

